Chocolate Peanut Butter Brownie Cupcakes

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Cupcakes:

10 tablespoons (1 1/4 sticks) unsalted butter, at room temperature, cut into small pieces

1/4 cup unsweetened cocoa powder (not Dutch process)

3 ounces unsweetened chocolate, finely chopped

2/3 cup boiling water

1 1/4 cups granulated sugar

1 teaspoon vanilla extract

2 large eggs

1 cup all-purpose flour

1/2 teaspoon baking powder

1/2 teaspoon fine salt

1/4 teaspoon baking soda

1/2 cup semisweet chocolate chips

Frosting:

1 cup creamy peanut butter

One 8-ounce package cream cheese, at room temperature

4 tablespoons (1/2 stick) unsalted butter, at room temperature

1 1/2 cups confectioners' sugar

Chopped dry roasted peanuts, for garnish (optional)